;(function flexible (window, document) {
    var docEl = document.documentElement
    var dpr = window.devicePixelRatio || 1
    
    // adjust body font size
    function setBodyFontSize () {
    if (document.body) {
    document.body.style.fontSize = (12 * dpr) + 'px'
    }
    else {
    document.addEventListener('DOMContentLoaded', setBodyFontSize)
    }
    }
    setBodyFontSize();
    
    // set 1rem = viewWidth / 10
    function setRemUnit () {
    var rem = docEl.clientWidth / 3.75
    docEl.style.fontSize = rem + 'px'
    }
    
    setRemUnit()
    
    // reset rem unit on page resize
    window.addEventListener('resize', setRemUnit)
    window.addEventListener('pageshow', function (e) {
    if (e.persisted) {
    setRemUnit()
    }
    })
    
    // detect 0.5px supports
    if (dpr >= 2) {
    var fakeBody = document.createElement('body')
    var testElement = document.createElement('div')
    testElement.style.border = '.5px solid transparent'
    fakeBody.appendChild(testElement)
    docEl.appendChild(fakeBody)
    if (testElement.offsetHeight === 1) {
    docEl.classList.add('hairlines')
    }
    docEl.removeChild(fakeBody)
    }
    }(window, document))